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How to implement a queue simply using two stacks and how to implement a highly efficient queue using two stacks.

7 Answers

Declare two stacks called in and out. queue.insert() calls in.push() queue.remove() if (out.notEmpty) out.pop() else { while(in.notEmpty) out.push(in.pop) } Don't get how this would be two questions.

Because that is the simple implementation, pretty much the exact same answer I gave them, there apparently is a more efficient way of modelling it.

Queue should implement FIFO. Let's have a group of task 1 -10 to be performed //declare two stacks Stack S1, S2; //feed stack S1 with the tasks 1 - 10 for(int i=1; i<=10;i++) { S1.push(i); } //Now S1 contains {10,9,8,7,6,5,4,3,2,1} where the top is 10 //Transfer all from S1 to S2 while(!S1.isEmpty()) { S2.push(S1.pop()); } //Now S2 contains {1,2,3,4,5,6,7,8,9,10} where the top is 1 You can now pop tasks from S2. Task 1 will be the first to pop and so on... Therefore, you just simulated FIFO using two stacks

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The first three questions are mental math. I still remember the hardest one is calculating the 39% of 569 without any pen or paper. The next question is a simple probability: pick 2 cards from a set of poker without 2 Jokers, what is the probability that both cards are Ks. The last one is brain teaser: what is the angle between the minute hand and hour hand on a clock when 9:30.

2 Answers

Calculating the max execution time of a program that had to fit into a certain size of memory on an embedded device.

2 Answers

given a list of pairs (parent, child) navigate the list of pairs and fill the supplied data structure: class Entry{ String data; Set Children } EG: { (A,B), (A,C), (A,D), (B,E), (E,F) }

2 Answers

what kind of projects have you worked on

1 Answer

How much experience do you have with pre-production research?

1 Answer

Behavioural questions about failures and challenges etc

1 Answer

Why did you apply for ibm.

1 Answer

Why do you want to work for IBM?

1 Answer

Overall experience and Excel abilities.

1 Answer
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